fix: restore startup grid picker

docs/devlogs/2026-07-09-restore-startup-grid-picker.md

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+# Restore startup grid picker
+
+Date: 2026-07-09
+Release target: unreleased
+
+## Summary
+
+- Restored the no-argument startup grid picker so the installed command matches the README and release notes.
+- Fixes #114.
+
+## What Changed
+
+- Replaced the stale multi-step composer flow with the fullscreen row/column picker.
+- Restored the live 2x3 default preview, numeric dimension controls, and direct launch plan creation from the configured default profile.
+- Removed stale guided-composer setup helpers that were no longer used.
+
+## Why It Matters
+
+- Running `gridbash` now starts with the expected grid-size choice instead of the older folder/profile/preview wizard.
+- Users can see and adjust the pane layout before spawning terminals.
+
+## Validation
+
+- `cargo fmt --check`
+- `cargo clippy -- -D warnings`
+- `cargo test`
+- `cargo build --release`
+- `npm run test:launcher`
+
+## Release Notes
+
+- Plain `gridbash` once again opens the startup grid picker with a live preview when no direct launch arguments are supplied.